(Jason Horowitz)

RICHMOND, Va. — Maybe "Romnesia" is contagious after all.

The Obama campaign's preferred catchphrase to describe what it considers Mitt Romney's shifting positions and overall shiftiness is familiar to the crowds he has visited this week in Iowa, Colorado, Florida and Virginia.

At an event here in Byrd Park, where some 15,000 people stretched from the stage to a bell tower, they shouted the faux affliction's name before Obama had a chance to. And Kandise Lucas, a 42-year-old educator from Richmond, wore a T-shirt designed by her husband that read "Educators Fighting the Spread of Romnesia."